package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     *
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {

    }
    /**
     *
     * 前置通知
     * @param joinPoint
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException {
        log.info("开始进行公共字段数据填充");
        //获取当前被拦截到的方法操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的数据库操作类型
        OperationType value = autoFill.value();//获取数据库操作类型

        //获取参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
          Long currentId = BaseContext.getCurrentId();

        //根据不同的方法操作类型，通过反射给对应的属性赋值
        if (value == OperationType.INSERT) {
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射给对应的属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }



        }else if (value == OperationType.UPDATE){
            //为两个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod( AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射给对应的属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);

            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }


}
